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Cobalt blue is a blue pigment made by sintering cobalt (II) oxide with aluminium (III) oxide (alumina) at 1200 °C. Chemically, cobalt blue pigment is cobalt (II) oxide-aluminium oxide, or cobalt (II) aluminate, CoAl 2 O 4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue.
Cobalt-based blue pigments (cobalt blue) have been used since antiquity for jewelry and paints, and to impart a distinctive blue tint to glass. The color was long thought to be due to the metal bismuth. Miners had long used the name kobold ore (German for goblin ore) for some of the blue pigment-producing minerals.
Cobalt blue pigment. Blue pigments are natural or synthetic materials, usually made from minerals and insoluble with water, used to make the blue colors in painting and other arts. The raw material of the earliest blue pigment was lapis lazuli from mines in Afghanistan, that was refined into the pigment ultramarine.
Blue also varies in shade or tint; darker shades of blue contain black or grey, while lighter tints contain white. Darker shades of blue include ultramarine, cobalt blue, navy blue, and Prussian blue; while lighter tints include sky blue, azure, and Egyptian blue (for a more complete list see the List of colours).
Blue in culture. Goblet from Mesopotamia, 1500–1300 BC glazed with Egyptian blue. This was the first synthetic blue, first made in about 2500 BC. The color blue has been important in culture, politics, art and fashion since ancient times. Blue was used in ancient Egypt for jewelry and ornament. [ 1] In the Renaissance, blue pigments were ...
Air force blue, also known as RAF blue, is used by the Royal Air Force, the first air force to choose an "air force blue" color by which to identify itself, in 1920. The color "air force blue" is a medium tone of azure since it has a hue code of 204 which is a hue code between 195 and 225, signifying a tone of azure.
Cambridge Blue (colour) Capri (color) Carolina blue. Cerulean. Cobalt blue. Cobalt glass. Color of water. Columbia blue. Copper phthalocyanine.
Powder blue is a pale shade of blue. [ 1] As with most colours, there is no absolute definition of its exact hue. Originally, powder blue, in the 1650s, was powdered smalt (cobalt glass) used in laundering and dyeing applications, and it then came to be used as a colour name from 1894. [ 2][ 3] Smalt has a deep, dark blue hue, but powder blue ...
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